Single and double sided ventless humidity cabinet

ABSTRACT

A ventless humidity cabinet system with entry window includes operating elements for providing an evenly heated humid air supply to products, such as food products, and utilizes any combination of air curtain fans, water tanks, inlet water lines, water inlet valves, wet heating elements, dry heating elements, water temperature probes, air temperature probes, air humidity probes, water level sensors, lower drain valves and a control computer.

[0001] This application is based upon a co-pending provisional patentapplication No. 60/186,528 filed on Mar. 02, 2000.

FIELD OF THE INVENTION

[0002] This invention relates generally to equipment, thermal equipmentand more particularly to high efficiency equipment for controlling heatand humidity as well as to take advantage of the heat capacity, densityand flow of humid air. The structural embodiment of the invention is animproved single and double sided doorless humidity cabinet.

BACKGROUND OF THE INVENTION

[0003] Thermal equipment, particularly thermal equipment in use in thefood industry, will ideally require as precise a thermal and humiditycontrol as possible. Because of the required ease of transport of food,most such equipment must have high user access, typically a rack oftrays for quick removal for use in loading, bringing to temperature andmaintaining temperature. Tray loading and storage usually requires awide opening such as a door which provides a continual stream of upsetto the internal environment. A unit of equipment needs to have theability to adjust from a condition of intermittent and continual usage.The food items recently added should come to a good temperature andhumidity condition quickly.

[0004] Complicating this goal is the physics associated with the insideof the unit of equipment. Where hot air sources and heating elements arepresent, there is a danger that the dry heat will harden the food, andthat the moist heat will condense on the food to make the food soggy.These are the extreme limits of wrong operation. More common are thecloser limits of wrong operation in that food on horizontal racks forexample, in the upper reaches overheats and dries out, whereas food onthe lower reaches experiences condensation and is too cool.

[0005] Physical and scientific limitations on a common space forenvironmental control are not only difficult to maintain, but monitoringin order that control may be effected is also problematic. Temperatureprobes without more don't indicate moisture. One hundred eighty degreesof moist heat can cause heat and moisture penetration into food to bringthe food to its final heated and moist condition more quickly. The sametemperature of dry heat could cause hardening and spoilage of the foodin a fraction of the time.

[0006] Application of heat is another problem. Where a pan is heated, nobenefit is had unless it is certain that water is present, and unless itis certain that the humidity reaches the other areas of the cabinet.Where a dry heating element is energized, the amount of heat leaving theelement before shut off depends upon the moisture, and therefore totalheat capacity of the volume of air in the unit of equipment. Thus,temperature alone will not give an indication of how much thermal energyhas been introduced. Humidity alone will not give an indication of howmuch thermal energy has been introduced, and neither will it enable aprojection based upon usage of the equipment for quick additionalmoisture and thermal input.

[0007] Another problem with conventional equipment configuration is thevented cabinet. Where a vent is provided, the cabinet continuously emitsa mixture of moisture and air representing losses in energy due to theraised temperature of the exiting components compared to ambienttemperature, and the energy which must be added to vaporize water toreplace the humidity lost from the vent. Vented systems also have aphysical limitation as to where they can be placed to insure that thevented exit does not cause condensation on other equipment or walls, andthat the condensation exit is not blocked as it would upset the steadystate temperature and moisture movements within the unit, and likelycause the food to become water laden or soggy.

SUMMARY OF THE INVENTION

[0008] The thermal environment equipment and process of the presentinvention is illustrated through structures and processes described withrespect to a single and double sided ventless humidity cabinet, andwhich may also optionally be a doorless humidity cabinet especially ifaccess occurs often enough such that operating a door would be anefficiency distraction, and is a working assembly made up of a number ofcomponent parts. The components for full illustration number sixteen,and include: cabinet box (housing), wet heating element(s) or wet heatsource, water temperature probe, inlet valve, drain valve, levelsensor(s), water, water level, Dry heating element(s) or dry heatsource, upper temperature probe or upper humidity probe(s), middletemperature probe(s) or middle humidity probe(s), lower temperatureprobe(s) or lower humidity probe(s), air curtain fan(s) both to isolatethe warm moist air inside from the dry cooler air outside, and toprovide internal circulation to the internal environment more even,doorless entry window(s), arrows showing laminar air flow directionforming air curtain and then mixing steam with dry heat, and a specialcustomizable wall that is normally only included in double sided unit.

[0009] The cabinet box for the ventless system is preferably made of arigid material such as metal or plastic and should be capable of safelyholding hot water and steam with minimum ambient thermal loss throughthe cabinet walls. The ventless steam cabinet shape most commonly is boxshape; however, for design efficiency or visual savvy can be any shapeor size as long as it can hold its humidity and perform the function ofproducing steamy humid environment for the products contained within.Ventless indicates that there is no deliberate vent for vapor and hotair, and that any escape of heated vapor air mixture is with the removalof food, or through leakage from the doorless opening, mitigated by theair door or air guarding flow at the service opening.

[0010] The inlet valve allows for the water to flow into the cabinet boxand can be manually or electronically controlled. The level sensor(s) isa device or devices that establish when the correct water level, theoptimum amount of water in the unit, has been reached. The level sensoris also a device that detects where the water is in the system. If thewater level is too low or too high, it will detect it, take an action,and could also generate error signals for other problems with the waterlevel. The level sensor can range from a simple float to a remote sonic,infrared, heat, electric, electronic, or other means of establishing thewater level. The water is heated with the wet heating element(s) or wetheat source which can be water immersible electric heating elements, gasheat, microwave, electronic, light, or other kind of heat generatingmethod or source. The water temperature probe detects the temperature ofthe water. The water temperature probe can be a simple thermistor to aninfrared, electronic, or other means for attaining water temperature.The drain valve allows for the water to flow out of the cabinet box andcan be manually or electronically controlled. The steam from the waterin the cabinet box provides a portion of the heat and most of thehumidity.

[0011] The dry heating element(s) or dry heat source which can be airelectric heating elements, gas heat, microwave, electronic, or otherkind of heat generating method or source and is used to dry out air andgenerate heat or dry hot air for the cabinet. The dry heating element(s)or dry heat source is most often placed at the top of the cabinet;however, this does not have to be the case and other methods ofinjecting dry heated air into the cabinet box could be used.

[0012] The upper temperature probe(s) or upper humidity probe(s), middletemperature probe(s) or middle humidity probe(s), and lower temperatureprobe(s) or lower humidity probe(s) detects the amount of humidity, dryheat, and temperature generated and how well the dry air and wet steamare mixing. The upper temperature probe(s) or upper humidity probe(s),middle temperature probe(s) or middle humidity probe(s), and lowertemperature probe(s) or lower humidity probe(s) can be a simplethermistor, humidity sensor to an infrared, electronic, or other meansfor attaining humidity and temperature. The upper temperature probe(s)or upper humidity probe(s), middle temperature probe(s) or middlehumidity probe(s), and lower temperature probe(s) or lower humidityprobe(s) represent three general zones for measurement, although less ormore may be utilized, the three being: lower, middle, and upper.

[0013] For Example, with a tall cabinet of over five feet, it may bedesirable to utilize more zones. However, it would be possible to useone of the probe locations creating one zone instead of three forcreating less cost and simplicity with a decrement in accuracy. This isespecially true for smaller units of equipment. The reverse would alsobe true in having more probes placed inside the cabinet adding to thecost and greatly increasing accuracy. Some units of equipment areequipped with doorless entry window(s) are/is the window through whichyou can grab the products inside through without having to open a door.By not having a door to open speed of service is greatly increased, anda lesser perturbation on the conditions within the equipment arecreated.

[0014] On a single sided ventless humidity cabinet, the ventless entrywindow is typically only on one side of the line. On a double sidedventless humidity cabinet there are typically two doorless entrywindows, one for each side so that workers can withdraw food on bothsides of a serving line pulling from the cabinet at the same time. Anoptional door may be used where access will not occur for some time, andto more efficiently enable the internals of the cabinet to churn withair flow and better accomplish moisture and thermal mixing.

[0015] In the double sided ventless humidity cabinet there maypreferably be a customizable wall in the cabinet box to prevent airflowfrom occurring into one side by its doorless entry window and out theother by its doorless entry window should they both be operated at thesame time. The custom wall can include small holed areas and doors tomove products from one side of the cabinet to the other with ease. Inthe majority of the cases you need a customizable wall in the cabinetbox to prevent airflow in one side and out the other. However, it wouldbe possible that in some locations which do not have large air movementand pressure differentials to operate with removal of the wallcompletely.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention, its configuration, construction, and operationwill be best further described in the following detailed description,taken in conjunction with the accompanying drawings in which:

[0017]FIG. 1 is a three dimensional idealized layout for a single sidedventless humidity cabinet; and

[0018]FIG. 2 is a three dimensional idealized layout for a 20 doublesided ventless humidity cabinet layout.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Referring to FIG. 1, a perspective view of a single sidedventless humidity cabinet 101. The cabinet 101 has side walls 103 and105, a top wall 107 and a bottom wall 109. A doorless entry opening orwindow 111 is located on a front wall 115 and is located opposite asolid back wall 117. The use of the term “doorless entry window”indicates an opening which in rapid use is not expected to have a doorto be opened and closed each time food is to be placed within orwithdrawn from the cabinet 101. This does not mean that the cabinet 101may not have a door for closure. However, any door it has should beconfigured to be out of the way during high usage periods and thecabinet 101 should be designed to work properly during such high usageperiods. Such a door becomes a “temporary closure” door during useagehours, and preferably will function as an isolation cover during longperiods of non-use. The term window applies to the Figures only if acovering structure is present, and when a covering structure is absent,it is an opening.

[0020] Within the cabinet 101 is an air curtain fan 121 which is shownas moving air along the inside of the rear of the doorless entry window111. This wall of air helps to prevent mass migration of moist air fromflowing into or leaving the inside of the cabinet 101. A watercontainment portion of the housing or cabinet 101 is seen as tank 125 isseen in the bottom of the cabinet 101 as an optionally separatestructure. The bottom of the cabinet 101 can be formed as a water tankportion, but a separate structure may facilitate servicing, maintenanceand inspection, etc. The water tank 125 will be used to create additionsto water vapor content in the air typically by heating the tank of waterto create increased water vapor pressure and to input heat ofvaporization for molecules of the water enter the air as humidity. It isunderstood that other devices for producing humidity can be usedincluding electrostatic discharge and atomization, etc. The illustrationof a tank with a heat source introduces but one method to create suchhumidity.

[0021] In any event a tank structure or tank 125 has associated with itan inlet line 127 having an inlet valve 129. Either inside or below thetank 125 is shown to be a wet heating element 131 which is shownentering the cabinet 101 and forming a loop at the bottom of tank 125.The liquid level of water within the tank 125 may also have associatedwith it a water temperature probe 133, a level sensor 135, and a lowerdrain 137 controlled by a lower drain valve 139, as well as an upperoverflow drain 141.

[0022] Supported in a position to have sensing contact with the air andhumid air space above the tank 125, and of differing elevations at theside wall 103 is a lower probe set 151 which may be a temperature orhumidity probe or both, a middle probe set 153 which may be atemperature or humidity probe or both, and an upper probe set 155 whichmay be a temperature or humidity probe or both.

[0023] A dry heating element 157 which is shown underneath the top wall107 of and entering the cabinet 101 and forming a loop at the upperregion of the cabinet 101 is shown. The dry heating element 157 can belocated anywhere within the cabinet 101, but is shown located at the topto emphasize the driving force differences between the dry and wet heat.

[0024] All of the components which provide sensing or control may betied into a computer 161, including inlet valve 129, wet heating element131, water temperature probe 133, level sensor 135, lower drain valve139, lower probe set 151, middle probe set 153, upper probe set 155 anddry heating element 157. Programming of the computer 161 can be effectedto measure the energy input into the system, measure the balance of wetand dry heat input, measure the humidity, measure the temperature,measure the fresh water input and either or both the input watertemperature, water tank 125 temperature and doorless entry window 111activation.

[0025] Control parameter output of the computer 161 can be speed andinlet selection of air for the air curtain fan 121, inlet flow and timefor operation of inlet valve 129, energization time and input energylevel for energization time and input energy level for dry heatingelement 157, flushing rate and time for lower drain 137 by control oflower drain valve 139, and wet heating element 131 both during normaloperation and in response to filling by operation of inlet valve 129.

[0026] The air curtain fan 121 blows outside air across the doorlessentry window 111 creating a wall of air and trapping the hotter, morehumid air inside the cabinet 101. The air curtain fan 121 is usuallyused to circulate a portion of the air inside the cabinet 101 andremoves the necessity for an independent circulation fan. The arrows ofFIG. 1 show generally laminar air flow in a direction forming an aircurtain. As the air within the cabinet 101 continues to circulate pastthe doorless entry window, and within the it cabinet generally, it thencontinues mixing steam or hot water vapor with dry heat in a continuallymixing pattern. The mixing pattern is generally consistent with the airflow pattern shown. In most instances the air curtain fan 121 is enoughto provide all of the circulation needs; however, an independent faninside the cabinet to circulate and mix the air can be employed,especially if the air curtain fan 121 is no sufficiently strong.

[0027] The air curtain fan 121 usually draws the air from the coldoutside air so the operators when they insert their hand are buffered bythe cold air wall and is an inexpensive method. In some operations itmay be necessary to draw the air from a heated source. The air curtainfan 121 is usually mounted on the bottom of the cabinet, however, fordesign efficiency or visual savvy it may be mounted remotely blowing airin the needed direction to form an air curtain. The air curtain fanusually blows from bottom to top, however, for design efficiency orvisual savvy it can blow the air top to bottom, right to left, left toright, or bottom to top.

[0028] Referring to FIG. 2, a three dimensional idealized layout for adouble sided ventless humidity cabinet 201 is seen. In general, the mainelements of the cabinet 201 are the same as the elements of cabinet 201,with some additions and strategic placement of elements seen in cabinet101.

[0029] The cabinet 201 has side walls 203 and 205, a top wall 207 and abottom wall 209. A front doorless entry window 211 is located on a frontwall 213 and a rear doorless entry window 215 is located opposite and ona back wall 217.

[0030] Within the cabinet 201 is a front air curtain fan 221 which isshown as moving air along the inside of the rear of the doorless entrywindow 211 and a second rear air curtain fan 223 which is shown asmoving air along the inside of the doorless entry window 215. These twpwalls of air help to prevent mass migration of moist air from flowinginto or leaving the inside of the cabinet 201. A water tank 225 is seenin the bottom of the cabinet 201 as an optionally separate structure,but common to both halves of the cabinet 201.

[0031] In any event a tank structure or tank 225 has associated with itan inlet line 227 having an inlet valve 229. Either inside or below thetank 225 is shown to be a common wet heating element 231 which is shownentering the cabinet 201 and forming a loop at the bottom of tank 225.The liquid level of water within the tank 225 may also have associatedwith it a water temperature probe 233, a level sensor 235, and a lowerdrain 237 controlled by a lower drain valve 239, as well as an upperoverflow drain 241. All these elements are commonly associated with thetank 225.

[0032] Supported in a position to have sensing contact with the air andhumid air space above the tank 225, and of differing elevations at theside wall 203 is a lower probe set 251 which may be a temperature orhumidity probe or both, a middle probe set 253 which may be atemperature or humidity probe or both, and an upper probe set 255 whichmay be a temperature or humidity probe or both. A dry heating element257 which is shown underneath the top wall 207 of and entering thecabinet 201 and forming a loop at the upper region of the cabinet 201 isshown. The probe sets 251, 253, and 255 are placed along a commonoptional divider wall 259 which can be used to completely segregate theflow patterns of the internal air flow. In this geometry, the probe sets251, 253, and 255 can measure an average of the temperatures (ifapplicable), humidities, (if applicable) or both (if applicable) oneither side of the wall 259. Where some bleeding over can occur, theprobe sets 251, 253, and 255 are in essence measuring an average set ofvalues. In some instances the wall 259 may be eliminated in its useentirely. In other instances, the wall 259 may be fitted with apertures260 to enable selected communication between first and second portionsformed by the subdividing presence of the wall 259.

[0033] All of the components which provide sensing or control may betied into a computer 261, including inlet valve 229, wet heating element231, water temperature probe 233, level sensor 235, lower drain valve239, lower probe set 251, middle probe set 253, upper probe set 255 anddry heating element 257. Programming of the computer 261 can be effectedto measure the energy input into the system, measure the balance of wetand dry heat input, measure the humidity, measure the temperature,measure the fresh water input and either or both the input watertemperature, water tank 225 temperature and doorless entry windows 211and 215 activation.

[0034] Control parameter output of the computer 261 can be speed,differential speed, inlet selection and differential inlet selection ofair for the air curtain fans 221 and 223, inlet flow and time foroperation of inlet valve 229, energization time and input energy levelfor energization time and input energy level for dry heating element257, flushing rate and time for lower drain 237 by control of lowerdrain valve 239, and wet heating element 231 both during normaloperation and in response to filling by operation of inlet valve 229.Differential control of the air curtain fans 221 and 223, can, whereprobes are advantageously placed, control the flow of moist air to theside needing it most, particularly where wall 259 may be partially open.

[0035] The inventions and structures of FIGS. 1 and 2 illustrate astructure and method for heating up water and air in order that productsmay be held at a settable humidity and temperature inside a cabinetwithout a door for easy access. The structure and method for heating upwater and air in order that products may be held at a settable humidityand temperature inside a cabinet 101, 201 without a door for easy accessis an assembly as has been shown to include a structure and method forcontaining the water system, a structure and method for holding waterand steam, a structure and method for heating the water and making steamor water vapor, a structure and method for measuring temperature, astructure and method for adding water, a structure and method forremoving water, a structure and method for sensing water, a structureand method for controlling water level, a structure and method forcontaining the cabinet system, a structure and method for distributingthe steam to the correct location, a structure and method for drying andheating air, a structure and method for sensing humidity and/ortemperature in the upper part of the unit, a structure and method forsensing humidity and/or temperature is the middle part of the unit, astructure and method for sensing humidity and/or temperature in thelower part of the unit, a structure and method for creating air flowacross the entry area or areas creating an air door, a structure andmethod for creating air flow inside the cabinet for circulation and themixing of dry heat with steam, and a customizable wall in the doublesided unit to prevent air travel in one opening and out the other whenthere are pressure differentials between sides.

[0036] The structure and method for containing the water system shouldbe made of a material that can hold the weight of water, steam, hot air,and devices for the life of the unit. It can vary in size and shape aslong as it can perform the function of heating water and turning aportion of it into steam. The structure and method for holding watershould allow for a water tight compartment that can hold hot water andsteam for long periods of time or indefinitely. The structure and methodfor adding water is simply having the ability to add water to theholding/heating area when needed. The structure and method for removingwater is simply having the ability to remove water from theholding/heating area when needed. The structure and method for sensingwater is simply the ability for the unit to sense where the water is inthe system. The structure and method for controlling water level is adevice or method that can raise and lower the water level in the system.The structure and method for heating the water, which is also shown aselement 131, 231, and making steam is a method of heating up the water,which can be done with electric element, gas, microwave, heat exchanger,or any other structure and method of heating available. The structureand method for measuring temperature is simply using a device to detectwhat the temperature of the water is so it can be regulated. A structureand method for containing a cabinet 101, 201 system is usually a box oroval-like container that can hold products or items inside and has oneor more openings with which to remove the items stored inside while atthe same time holding the unique atmosphere inside with respect totemperature and humidity. A structure and method for drying and heatingup air can be done with electric elements, gas, microwave, heatexchanger, or any other structure and method of heating available.

[0037] A structure and method for sensing humidity and/or temperature,using selected ones of the probe sets 151, 153, 155, 251, 253, or 255,in the upper part of the unit or cabinet 101, 201 provides a way tomeasure or approximate/estimate through a remote sensor or run timedata, especially computer 161, 261, what the humidity and/or temperatureis in the upper part of the cabinet 101, 201. A structure and method forsensing humidity and/or temperature in the middle part of the unit orcabinet 101, 201 using the probe sets 151, 153, 155, 251, 253, or 255 isa way to measure or approximate/estimate through remote sensor or runtime data what the humidity and/or temperature is in the middle part ofthe cabinet. A structure and method for sensing humidity and/ortemperature in the lower part of unit, as in probe sets 151, 153, 155,251, 253, or 255, is a way to measure or approximate/estimate through aremote sensor or run time data what the humidity and/or temperature isin the lower part of the cabinet. The upper, middle and lower probe sets151, 153, 155, 251, 253, or 255 can be combined into one probe set toreduce cost and decrease accuracy and the reverse can also take placewhere the cabinet can be divided into numerous parts that increaseaccuracy and price. A structure and method for creating air flow acrossthe entry area or areas creating an air door is a structure and methodof blowing air across the front of the entry area in order to keep theinside environment inside the cabinet 101, 201, contained. A structureand method for creating air flow inside the cabinet 101, 202 forcirculation and the mixing of dry heat with steam is simply creating amixing air flow inside the cabinet to balance out the humidity andtemperature throughout the cabinet. It can be done in some instanceswith just the air flow from the structure and method of blowing airacross the front of the entry area, such as at entry window 111, 211;however, in other instances additional air moving technology would needto be employed for additional circulation. A customizable wall 259 inthe double sided unit to prevent air travel in one opening and out theother when there are pressure differentials between sides is usuallyneeded when there is the possibility of air flow in one opening and outthe other. In conditions where air does not travel in one opening andout the other, the customizable wall in the double sided unit can beremoved. The wall 259 can be solid or it can have holes in differentareas to allow for certain types of air flow between the two areas.

[0038] Although the invention has been derived with reference toparticular illustrative embodiments thereof, many changes andmodifications of the invention may become apparent to those skilled inthe art without departing from the spirit and scope of the invention.Therefore, included within the patent warranted hereon are all suchchanges and modifications as may reasonably and properly be includedwithin the scope of this contribution to the art.

What is claimed:
 1. A ventless environmental system comprising: acabinet housing having an entry window; an air curtain output adjacentsaid entry window for moving air generally parallel to said entrywindow; a first source of vaporizing moisture within said cabinethousing; at least one sensor for measuring at least one of humidity andtemperature within said and housing; a first source of dry heat withinsaid cabinet housing, said air curtain for moving air within saidcabinet housing to expose said air to both said first source ofvaporizing moisture and said first source of dry heat; and a controllerfor controlling at least one of said first source of dry heat, saidfirst source of vaporizing moisture, and said air curtain output inresponse to said at least one sensor.
 2. The ventless environmentalsystem as recited in claim 1 and further comprising a plurality of saidat least one sensors within said housing, located at least two heightswithin said housing.
 3. The ventless environmental system as recited inclaim 1 and wherein said first source of vaporizing moisture within saidcabinet housing further comprises: a water containment structure withinsaid housing; and a source of heat directed to heat water containedwithin said water containment structure.
 4. The ventless environmentalsystem as recited in claim 3 and further comprising a source of fillcontrolled by a fill valve and a source of drainage controlled by adrainage valve, both said fill valve and said drainage valvecontrollably connected to and controlled by said controller.
 5. Theventless environmental system as recited in claim 1 wherein said aircurtain output is also for creating air flow inside said housing forcirculation and mixing of the first source of vaporizing moisture andfirst source of dry heat within said cabinet housing.
 6. A ventlessenvironmental system comprising: a cabinet housing having a first accessopening and a second access opening; a first air curtain outputassociated with said first access opening and a second air curtainoutput associated with said second access opening for moving airgenerally parallel to its associated said first and said second accessopenings; a first source of vaporizing moisture within said cabinethousing; at least one sensor for measuring at least one of humidity andtemperature within said and housing; a first source of dry heat withinsaid cabinet housing, said air curtain for moving air within saidcabinet housing to expose said air to both said first source ofvaporizing moisture and said first source of dry heat; and a controllerfor controlling at least one of said first source of dry heat, saidfirst source of vaporizing moisture, and said air curtain output inresponse to said at least one sensor.
 7. The ventless environmentalsystem as recited in claim 6 and further comprising a plurality of saidat least one sensors within said housing, located at least two heightswithin said housing.
 8. The ventless environmental system as recited inclaim 6 and wherein said first source of vaporizing moisture within saidcabinet housing further comprises: a water containment structure withinsaid housing; and a source of heat directed to heat water containedwithin said water containment structure.
 9. The ventless environmentalsystem as recited in claim 8 and further comprising a source of fillcontrolled by a fill valve and a source of drainage controlled by adrainage valve, both said fill valve and said drainage valvecontrollably connected to and controlled by said controller.
 10. Theventless environmental system as recited in claim 6 wherein said aircurtain output is also for creating air flow inside said housing forcirculation and mixing of the first source of vaporizing moisture andfirst source of dry heat within said cabinet housing.
 11. The ventlessenvironmental system as recited in claim 6 wherein said first and secondaccess openings are openable and closeable entry windows located onopposite sides of said housing.
 12. The ventless environmental system asrecited in claim 6 and further comprising a divider wall at leastpartially dividing said housing into a first portion associated withsaid first access opening and a second access opening.
 13. The ventlessenvironmental system as recited in claim 12 and further comprising aplurality of said at least one sensors within said housing, locatedalong said divider wall within said housing and enabled to measureconditions in both said first and said second portions.
 14. The ventlessenvironmental system as recited in claim 12 and wherein said dividerwall includes a plurality of strategically placed apertures to enableselected communication between said first and said second portions.